"The Mass of Objects and Its Measurement" Scale, Mass and Density of the Material World PPT Courseware 5

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"The Mass of Objects and Its Measurement" Scale, Mass and Density of the Material World PPT Courseware 5

Review goals:

1. Be able to use the scale correctly and measure length and read it correctly.

2. Understand that mass is an attribute of matter and does not change with changes in the shape, state, and position of matter.

3. Be able to skillfully use a balance to measure the mass of solids and liquids.

4. Understand the relevant knowledge of density (definition, formula, units and conversion between units, etc.).

5. Able to measure the density of solids and liquids.

6. Be able to use density knowledge to solve practical problems.

Scale usage practice

1. In the picture, the correct way to measure the width of a wooden block using a scale is ( ).

2. The basic tool for measuring length is ____. As shown in the figure, the division values ​​of the two scales are: A__B__, and the lengths of the objects are:

A____B____.

Basic knowledge:

Basic knowledge about quality

1. The ______ contained in an object is called mass. Mass is a kind of ______ of matter and does not change with the changes of ______, ______, and ______ of the object. Now the internationally accepted unit of mass is ______.

2.1 tons =______kg,

3.1 kilogram = ______ grams,

4.1 grams = ______ milligrams.

About the concept and physical meaning of density

1. The _____ of a certain substance per unit volume is called density. From a definition point of view, the density of a certain substance is equal to the _________ of its mass and volume.

2. The mass of different objects with the same volume is ________. Density is the physical quantity that reflects this characteristic of matter.

3． Density is a type of substance and is related to the type of substance.

4. Water and kerosene have the same mass, but the one with the larger volume is _____.

5. The density of water is _____kg/m3, which means _____.

Basic formulas and their applications

Represents density, the main unit is kilogram/cubic meter

Represents mass, the main unit is kilogram

Represents volume, the main unit is cubic meter

Basic measurement tools and their usage requirements

Scale - measure the length of an object

Graduated cylinder – measuring the volume of liquids and solids

Balance - measure the mass of an object

Experiment: Use a balance and measuring cylinder to measure density

Typical questions:

1. The following values ​​are estimates of the body mass of classmates. Which one do you think is closer ( )

A, 8.5×103 grams; B, 3×102 kilograms; C, 1×10-2 tons; D, 5×107 mg.

2. The mass of an object on the earth is 20 kilograms. If this object is moved to the moon, its mass will be ( )

A, greater than 20 kilograms; B, less than 20 kilograms; C, equal to 20 kilograms; D, cannot be determined.

3. The correct understanding of the following methods of operating a balance is ( )

A. The mass of the object to be measured must exceed the weighing capacity of the balance.

B. When measuring the mass of an object, the object to be measured should be placed on the right plate of the balance.

C. When weighing the mass of an object, if the balance is found to be unbalanced, the balance nut on the weighing beam can be adjusted to balance the balance.

D. Do not place wet objects or chemicals directly on the tray of the balance to weigh them. They can be weighed in a beaker.

Apply what you learn:

1. The following table is the two experimental plans designed by students A and B in the experiment of measuring the density of salt water with a balance and a measuring cylinder.

The value of ρ brine measured using scheme ____ is more accurate. This is because in scheme B, the measurement error of the physical quantity _____ is larger, making the value of ρ brine biased towards _____ (please fill in "large" or "small" ").

2. As shown in Figure 6-7, it represents the relationship between the mass and volume of the three substances A, B, and C. It can be seen from the figure ( )

A.ρA>ρB>ρC, and ρA>ρwater

B.ρA>ρB>ρC, and ρA>ρwater

C.ρC>ρB>ρA, and ρA<ρwater

D.ρC>ρB>ρA, and ρA>ρwater

3. The density of iron is 7.9×103 kg/m3. If a small iron block is added to a measuring cylinder filled with water and the liquid level in the measuring cylinder rises by 10 ml, what is the mass of the small iron block?

What learned:

1: Understand that mass is an attribute of matter and does not change with changes in the shape, state, and position of matter.

2. Be able to skillfully use a balance to measure the mass of solids and liquids.

3. Understand the relevant knowledge of density (definition, formula, units and conversion between units, etc.).

4. Able to measure the density of solids and liquids.

5. Be able to use density knowledge to solve practical problems.

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Update Time: 2024-10-12

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